Guardian Frigerator Company developed the first stand alone refrigerator in the US in 1916 and became Frigidaire in 1919 and a part of General Motors at that time until they sold in it in 1979.
Up until that time most refrigeration was accomplished with iceboxes.
Many people still call any refrigerator a Fridge and really have no idea why they do nor where the name came from..
Kinda like Kleenex, Kotex, Big Tex etc.
Thank you Mr Peabody......